Stable water isotope and surface heat flux simulation using ISOLSM: evaluation against in-situ measurements

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dc.contributor.authorCai, MYen_AU
dc.contributor.authorWang, Len_AU
dc.contributor.authorParkes, SDen_AU
dc.contributor.authorStrauss, Jen_AU
dc.contributor.authorMcCabe, MFen_AU
dc.contributor.authorEvans, JPen_AU
dc.contributor.authorGriffiths, ADen_AU
dc.date.accessioned2017-05-11T04:42:33Zen_AU
dc.date.available2017-05-11T04:42:33Zen_AU
dc.date.issued2015-04en_AU
dc.date.statistics2017-05-11en_AU
dc.description.abstractThe stable isotopes of water are useful tracers of water sources and hydrological processes. Stable water isotope-enabled land surface modeling is a relatively new approach for characterizing the hydrological cycle, providing spatial and temporal variability for a number of hydrological processes. At the land surface, the integration of stable water isotopes with other meteorological measurements can assist in constraining surface heat flux estimates and discriminate between evaporation (E) and transpiration (T). However, research in this area has traditionally been limited by a lack of continuous in-situ isotopic observations. Here, the National Centre for Atmospheric Research stable isotope-enabled Land Surface Model (ISOLSM) is used to simulate the water and energy fluxes and stable water isotope variations. The model was run for a period of one month with meteorological data collected from a coastal sub-tropical site near Sydney, Australia. The modeled energy fluxes (latent heat and sensible heat) agreed reasonably well with eddy covariance observations, indicating that ISOLSM has the capacity to reproduce observed flux behavior. Comparison of modeled isotopic compositions of evapotranspiration (ET) against in-situ Fourier Transform Infrared spectroscopy (FTIR) measured bulk water vapor isotopic data (10 m above the ground), however, showed differences in magnitude and temporal patterns. The disparity is due to a small contribution from local ET fluxes to atmospheric boundary layer water vapor (∼1% based on calculations using ideal gas law) relative to that advected from the ocean for this particular site. Using ISOLSM simulation, the ET was partitioned into E and T with 70% being T. We also identified that soil water from different soil layers affected T and E differently based on the simulated soil isotopic patterns, which reflects the internal working of ISOLSM. These results highlighted the capacity of using the isotope-enabled models to discriminate between different hydrological components and add insight into expected hydrological behavior. © 2015, Elsevier B.V.en_AU
dc.identifier.citationCai, M. Y., Wang, L., Parkes, S. D., Strauss, J., McCabe, M. F., Evans, J. P., & Griffiths, A. D. (2015). Stable water isotope and surface heat flux simulation using ISOLSM: evaluation against in-situ measurements. Journal of Hydrology, 523, 67-78. doi:10.1016/j.jhydrol.2015.01.019en_AU
dc.identifier.govdoc8204en_AU
dc.identifier.issn0022-1694en_AU
dc.identifier.journaltitleJournal of Hydrologyen_AU
dc.identifier.pagination67-78en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jhydrol.2015.01.019en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8693en_AU
dc.identifier.volume523en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectIsotopesen_AU
dc.subjectSpectroscopyen_AU
dc.subjectStable isotopesen_AU
dc.subjectMeteorologyen_AU
dc.subjectOxygenen_AU
dc.subjectHydrogenen_AU
dc.titleStable water isotope and surface heat flux simulation using ISOLSM: evaluation against in-situ measurementsen_AU
dc.typeJournal Articleen_AU
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